Resumming the color-octet contribution to radiative Y decay

Christian W. Bauer, Cheng Wei Chiang, Sean Fleming, Adam K. Leibovich, Ian Low

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


At the upper end point of the photon energy spectrum in Y→Xγ, the standard NRQCD power counting breaks down and the OPE gives rise to color-octet structure functions. Furthermore, in this kinematic regime large Sudakov logarithms appear in the octet Wilson coefficients. The end point spectrum can be treated consistently within the framework of a recently developed effective field theory of collinear and soft particles. Here we show that within this approach the octet structure functions arise naturally and that Sudakov logarithms can be summed using the renormalization group equations. We derive an expression for the resummed energy spectrum and, using a model light cone structure function, investigate the phenomenological importance of the resummation.

Original languageEnglish (US)
Article number114014
Pages (from-to)1140141-11401410
Number of pages10261270
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
StatePublished - Dec 1 2001

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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